AustemperingTime and Its Influence on the Mechanical Performance of Inverse Bainite: Insights from Hardness, Toughness, and Strength Testing

Aqil Inam, ()
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Aqil Inam,: Institute of Metallurgy & Materials Engineering, University of the Punjab, 54590, Lahore, Pakistan

International Journal of Innovations in Science & Technology, 2024, vol. 6, issue 4, 1932-1942

Abstract: This study examines the impact of austemperingtime on the mechanical properties of 0.8C experimental steel with inverse bainitic microstructures. Samples were austenitized at 900 °C and austempered at 420 °C for 30, 60, 90, and 120 minutes. The effects on hardness, impact toughness, and (UTS) were analyzed. Microstructural evaluations by optical microscope, scanning electron microscope, and energy dispersive spectroscopy confirmed the formation of inverse bainite. Mechanical testing showed that increasing austempering time leads to higher hardness dueto cementite lath growth and reduced ferrite content, but also results in lower Charpy impact energy, indicating reduced toughness. While UTS initially decreases, it increases sharply after 120 minutes, accompanied by brittle fracture. This study suggeststhat prolonged austempering enhances hardness and strength but increases brittleness, making these structures less suitable for applications involving sudden forces.

Keywords: Inverse Bainite,AustemperingTime, Hardness, Impact Strength; Mechanical Properties (search for similar items in EconPapers)
Date: 2024
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